Hydrogen & Clean Fuels - Abstract
High Pressure Hydrogen Permeance of Porous Stainless Steel Coated with a Thin Palladium Film via Electroless Plating
The high-pressure (100-2500 kPa) hydrogen permeance of two membranes, each composed of a thin palladium film (~22 mm) deposited on the oxidized surface of a porous stainless steel tubular substrate (0.2 mm grade support) has been determined over the 623 – 723 K temperature range. The hydrogen flux was proportional to the H2 partial pressure in the retentate raised to an exponent of ~0.55 for one membrane and ~0.64 for the other, indicating that the transport of hydrogen through the composite membrane was primarily limited by bulk diffusion. Overall, the hydrogen permeance of these membranes was within a wide range of values previously reported with thin film palladium membranes of comparable thickness.